Bornan-2-one

Acute Toxicity: oral

Administrative data

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2019

Report date:

2019

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method)

GLP compliance:

yes (incl. QA statement)

Test type:

acute toxic class method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Bornan-2-one

EC Number:

200-945-0

EC Name:

Bornan-2-one

Cas Number:

76-22-2

Molecular formula:

C10H16O

IUPAC Name:

1,7,7-trimethylbicyclo[2.2.1]heptan-2-one

Test material form:

solid: particulate/powder

Specific details on test material used for the study:

Test Item bornan-2-one
Synonyms Camphor Synthetic DAB6
Lot Number 380158
CAS No 76-22-2
EINECS No. 200-945-0
Molecular Formula C10H16O
Molecular weight 152.23 g/mol
Purity > 95.9%
Appearance White powder crystals
Composition bornan-2-one
Homogeneity NA
Production Date 2018-07-20
Expiry Date 2020-07-20
Storage Room temperature (20 ± 5°C)
Test Item Handling and Storage According to S0PA-00147-BIO, Test and Reference Items

Test animals

Species:

rat

Strain:

Wistar

Sex:

female

Details on test animals or test system and environmental conditions:

Species Wistar rats
Source Slovak Academy of Sciences Dobrá Voda, Slovak Republic
Number and Sex of Animals 6 females
Age at First Dose 8-9 weeks; female animals were non-pregnant and nulliparous
Animal Health Health condition of animals was examined by a veterinarian before initiation of the study.
Acclimation The animals were acclimated under the conditions identical to the conditions during the experiment 5 days prior to the start of treatment. The acclimation was according to the standard operation procedure.
Housing Condition The animals were housed in plastic cages suspended on stainless steel racks, 3 animals per cage in a room equipped with central air-conditioning. The average room temperature was maintained within the range of 22.12 ± 0.24 °C, relative humidity within 54.92 ± 2.46 %. The light regimen was set to a 12-hour light /12-hour dark cycle. Sanitation was performed according to the standard operation procedures.
Diet The laboratory food ssniff (ssniff Spezialdiäten GmbH, Germany) was available ad libitum. The certificate of analysis is included in the raw data.
Water The animals received tap water for human consumption. Supply of drinking water was unlimited. The quality of drinking water is periodically analysed and recorded; certificate of analysis is included in the raw data.
Bedding Lignocel S3/4, Lufa - ITL GmbH, Germany
Animals Identification The animals in the cage were marked by a line (I-III) on the tail with a waterproof marker. Each cage was marked with the study code, ID of animals and date of administration of the test item.
Justification for the Choice of Species Normally females are used for testing according to OECD TG 423 because females are typically the more sensitive gender.

Administration / exposure

Route of administration:

oral: gavage

Vehicle:

olive oil

Details on oral exposure:

The test item was administered in a single dose by gavage using a metal stomach tube. Animals were fasted 10-12 h prior to dosing (food but not water was withheld over-night). Following a period of fasting, animals were weighed and the test item administered. After test item administration, food was withheld for further 3-4 hours.

Doses:

The starting dose could be selected from the fixed dose levels of 5, 50, 300, and 2000 mg/kg body weight. A limit dose of 2000 mg/kg body weight was used as a starting dose. One group of 3 females was dosed. Test item-related mortality was not observed during 24 hours and therefore, in a second step, another 3 females were treated at the same dose.
The required amount of the test item (according to the body weight and dose) was mixed with vehicle (Olive oil) shortly before administration. The dose of 2000 mg/kg was administered in a volume of 5 mL/kg body weight.

No. of animals per sex per dose:

6

Control animals:

no

Details on study design:

Animals were observed individually immediately after administration of the test item and 0.5, 1, 2, and 4 hours later. Each animal was inspected daily for the next 14 days.
Observations included: changes in skin, fur, eyes, mucous membranes, respiratory, circulatory, autonomic and central nervous systems, somatomotor activity, and behavioural pattern. Particular attention was given to potential neurologic endpoints such as tremors, convulsions, salivation, diarrhoea, lethargy, sleep and coma.

Results and discussion

Preliminary study:

A limit dose of 2000 mg/kg body weight was used as a starting dose. One group of 3 females was dosed. Test item-related mortality was not observed during 24 hours.

Effect levels

Key result

Sex:

female

Dose descriptor:

LD50 cut-off

Effect level:

> 5 000 mg/kg bw

Based on:

test mat.

Mortality:

All (6/6 females) animals survived the limit dose of 2000 mg/kg body weight.

Clinical signs:

other: No mortality was observed during the study. Thirty minutes after administration of the test item, tremor was observed in animal No 3, spasms in animal No 6 and lethargy in animals No 1, 4, 5, 6. Lethargy in animal No 4 persisted during the next hour. Trem

Gross pathology:

All animals were necropsied. During necropsy, no macroscopic findings were observed.

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

The LD50 of the test item “bornan-2-one” is greater than 2000 mg/kg body weight after single oral administration to Wistar rats.
Based on Annex 2d Test Procedure with a Starting Dose of 2000 mg/kg body weight of OECD Guideline 423 it can be concluded that the test item “bornan-2-one” is according to GHS criteria classified in Category 5 or Unclassified with a LD50 cut off value equal to or greater than 5000 mg/kg body weight, after single oral administration to Wistar rats.